EP0122975B1 - Device and method for detecting leaks in the combustion system of a water-cooled internal-combustion engine - Google Patents

Device and method for detecting leaks in the combustion system of a water-cooled internal-combustion engine Download PDF

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Publication number
EP0122975B1
EP0122975B1 EP19830112975 EP83112975A EP0122975B1 EP 0122975 B1 EP0122975 B1 EP 0122975B1 EP 19830112975 EP19830112975 EP 19830112975 EP 83112975 A EP83112975 A EP 83112975A EP 0122975 B1 EP0122975 B1 EP 0122975B1
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EP
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Prior art keywords
gas
water
measuring
cooling water
combustion engine
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EP19830112975
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German (de)
French (fr)
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EP0122975A1 (en
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Hubert Deissler
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
    • G01M3/228—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators for radiators

Definitions

  • the invention relates to a device for detecting leaks in the combustion system of a water-cooled internal combustion engine by analyzing gas from the cooling water circuit for content of carbon monoxide and / or carbon dioxide with a probe which has a chamber, the chamber with its inflow end sealing against the filler opening of the cooling water tank of the cooling water circuit can be connected and is connected at its other end to a suction device and with a measuring device for gas analysis on the suction side of the suction device.
  • the invention also relates to a method for detecting leaks in the combustion system of a water-cooled internal combustion engine by analyzing gas from the cooling water circuit for carbon monoxide and / or carbon dioxide content, in which measuring gas is extracted from the gas area of the cooling water system while the internal combustion engine is running and is sucked past a measuring point and in which at the measuring point the content of the measuring gas of carbon monoxide and / or carbon dioxide is measured, which indicate combustion gas from the internal combustion engine.
  • the cause can be a leak in the cooling water system, through which outside air is drawn in, or a leak in the adjacent parts of the internal combustion engine, for example a sealing ring, through which exhaust gas is drawn in.
  • a leak in the cooling water system through which outside air is drawn in
  • a leak in the adjacent parts of the internal combustion engine for example a sealing ring, through which exhaust gas is drawn in.
  • test liquid For this purpose, according to a known method (GB-A-1 438 913 and US-A-3 625 656), some gas is removed from the cooling water system, pressed through a test container filled with test liquid, the test liquid of which reacts with the carbon monoxide, if any and undergoes a color change. New test liquid is required for each test.
  • the invention has for its object to avoid the effort associated with the constant procurement and refilling of test liquid and to make the devices used in the carbon monoxide exhaust gas analysis, based on the infrared absorption measurement, for the detection of leaks in the combustion system of a water-cooled internal combustion engine.
  • the chamber is designed as a water separating chamber, that a float-controlled shut-off valve which can be actuated by the separated water is provided in the probe, and that the measuring device for gas analyzes designed as a flow measuring device is, however, upstream from the chamber and the shut-off valve a pump is arranged as a suction device for the sample gas.
  • This object is achieved in the method in that the water entrained by the measuring gas is separated before the measuring gas reaches the measuring point, that the separated water is collected and that the measuring gas flow is shut off by the measuring point depending on the entrained water.
  • the invention is applicable in connection with the measurement of the CO content in exhaust gases for the cases in which the exhaust gas of the internal combustion engine normally contains sufficient CO.
  • the invention takes advantage of the fact that, due to the modern exhaust gas regulations in motor vehicle repair workshops where such tests are carried out, carbon monoxide test devices are available for checking the carbon monoxide content in the exhaust gas, which are designed to be correspondingly precise and complex because of the accuracy required for exhaust gas analysis and based on infrared absorption measurement.
  • the invention makes it possible to measure the CO content in the cooling water system with devices such as these.
  • the invention also makes use of the high measuring accuracy of the existing CO measuring devices, which is required anyway for other reasons, and makes it usable for the method mentioned at the beginning.
  • the vacuum will set in after a short suction time and this is a sure sign that the cooling water system is tight, that is to say it has no leakage either to the internal combustion engine or to the outside.
  • the vacuum is not a physical vacuum, but a technical vacuum, because in view of the fact that the water separation is only carried out to a certain degree, there will always be a small amount of water vapor in the area between the water separation and the suction pump.
  • the drawing shows a probe with associated flow measuring device in cross section.
  • 1 generally designates the probe which is connected to the cooling water tank 2 of the cooling water circuit of a water-cooled internal combustion engine.
  • 3 with a flow measuring device for gas analyzes is designated, which is connected via a hose 4 to the probe 1 and in turn is connected to the suction side of a gas pump 5, the pressure side leads to the outside.
  • the flow measuring device 3 makes it possible to carry out gas analyzes for the content of carbon monoxide and carbon dioxide in the measuring gas flowing through and also allows the gas volume flowing through in the time unit to be measured.
  • the probe 1 consists of a tube piece 6 made of transparent material, for example glass or plastic, which is closed at its inlet end drawn below by a cone 7 tapering towards its inlet end.
  • the cone 7 is made of rubber or rubber-elastic plastic and has an inlet channel 8 which opens into the water separation chamber 9 enclosed by the pipe section 6.
  • the pipe section 6 is closed by a cap 10 which is penetrated by a connecting piece 11 which has an outlet channel 12.
  • the pipe section 6 is circular cylindrical to the axis 13.
  • the cone 7 and the connecting piece 11 are formed and arranged coaxially to the axis 13.
  • a riser pipe socket 14 extends, the end of which is closed by a cap 15.
  • Below the cap 15 a plurality of outlet openings 16, 17 are provided distributed over the circumference.
  • the probe 1 sits tightly inserted into the circular fill opening 20 of the cooling water tank 2.
  • the fill opening 20 is located in the horizontal upper wall 21 of the cooling water tank 2 and is consequently open horizontally and upwards, so that the probe as shown with the vertical axis 13 is plugged in and is in the functional position.
  • a water separating valve 22 is accommodated in the connecting piece 11.
  • the water separating valve 22 includes a ball 24 that floats in water, a valve seat 23 arranged downstream of this, and a holder 25 arranged upstream of the ball 24.
  • the ball 24 rests on the holder 25 and releases the gas passage through the connecting piece 11. If water gets into the connecting piece 11, the ball is carried up floating, leans against the valve seat 23 and shuts off the connecting piece 11 for further flow.
  • the hose 4 which leads to the inlet connection of the flow measuring device 3, is placed on the connecting piece 11.
  • the carbon monoxide content and / or the carbon dioxide content of the measuring gas flowing through is continuously measured in the flow measuring device 3. This is preferably an absorption measurement in the infrared range.
  • the device operates as follows. When the internal combustion engine is running, the probe is brought into the functional position shown and the gas pump 5 is switched on. In this way, gas located above the cooling water level 26 is extracted. This gas flows through the inlet channel 8 and the openings 16, 17 into the water separating chamber 9. Water content will condense and flow downwards and collects in the lower area of the water separating chamber 9. The dry gas flows through the hose 4 as measuring gas to the flow measuring device measured and then flows through the gas pump 5 into the open.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Examining Or Testing Airtightness (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Erkennen von Undichtigkeiten des Verbrennungssystems einer wassergekühlten Brennkraftmaschine durch Analysieren von Gas aus dem Kühlwasserkreislauf auf Gehalt an Kohlenmonoxid und/oder Kohlendioxid mit einer Sonde, die eine Kammer aufweist, welche Kammer mit ihrem einströmseitigen Ende dichtend an die Einfüllöffnung des Kühlwasserbehälters des Kühlwasserkreislaufes anschließbar ist und mit ihrem anderen Ende an eine Saugeinrichtung angeschlossen ist und mit einer Meßeinrichtung für Gasanalyse sogseitig der Saugeinrichtung.The invention relates to a device for detecting leaks in the combustion system of a water-cooled internal combustion engine by analyzing gas from the cooling water circuit for content of carbon monoxide and / or carbon dioxide with a probe which has a chamber, the chamber with its inflow end sealing against the filler opening of the cooling water tank of the cooling water circuit can be connected and is connected at its other end to a suction device and with a measuring device for gas analysis on the suction side of the suction device.

Die Erfindung betrifft außerdem ein Verfahren zum Erkennen von Undichtigkeiten des Verbrennungssystems einer wassergekühlten Brennkraftmaschine durch Analysieren von Gas aus dem Kühlwasserkreislauf auf Gehalt an Kohlenmonoxid und/oder Kohlendioxid, bei dem bei laufender Brennkraftmaschine aus dem Gasbereich des Kühlwassersystems Meßgas abgesaugt und an einer Meßstelle vorbeigesaugt wird und bei dem an der Meßstelle der Gehalt des Meßgases an Kohlenmonoxid und/oder Kohlendioxid gemessen wird, die auf Verbrennungsgas der Brennkraftmaschine schließen lassen.The invention also relates to a method for detecting leaks in the combustion system of a water-cooled internal combustion engine by analyzing gas from the cooling water circuit for carbon monoxide and / or carbon dioxide content, in which measuring gas is extracted from the gas area of the cooling water system while the internal combustion engine is running and is sucked past a measuring point and in which at the measuring point the content of the measuring gas of carbon monoxide and / or carbon dioxide is measured, which indicate combustion gas from the internal combustion engine.

Wenn in das Kühlwassersystem durch Fehlfunktion Luft oder Abgas gelangt, dann zeigt sichdas durch eine Fehleranzeige, durch Überlaufen des Kühlwassers an einem Sicherheitsventil oder dergleichen. Ursache kann eine Undichtigkeit des Kühlwassersystems sein, durch die Außenluft angesaugt wird, oder eine Undichtigkeit der angrenzenden Teile der Brennkraftmaschine sein, zum Beispiel eines Dichtungsringes, durch die Abgas angesaugt wird. Bei der Suche nach der Undichtigkeit kann man diese eingrenzen, indem man das im Kühlwassersystem befindliche Gas auf Kohlenmonoxidgehalt untersucht. Ist kohlenmonoxid vorhanden, dann liegt die Undichtigkeit in einem Teil der Brennkraftmaschine, ist kein Kohlenmonoxid vorhanden, dann liegt die Undichtigkeit in einem anderen Teil des Kühlwassersystems, durch das Außenluft eindringt. Zu diesem Zweck wird nach einem bekannten Verfahren (GB-A-1 438 913 und US-A-3 625 656) etwas Gas dem Kühlwassersystem entnommen, durch einen mit Testflüssigkeit gefüllten Testbehälter gedrückt, dessen Testflüssigkeit mit dem Kohlenmonoxid - so solches vorhanden - reagiert und einen Farbumschlag erfährt. Für jede Untersuchung wird dazu neue Testflüssigkeit benötigt.If air or exhaust gas enters the cooling water system due to malfunction, this is shown by an error display, by overflow of the cooling water at a safety valve or the like. The cause can be a leak in the cooling water system, through which outside air is drawn in, or a leak in the adjacent parts of the internal combustion engine, for example a sealing ring, through which exhaust gas is drawn in. When looking for the leak, you can narrow it down by examining the gas in the cooling water system for carbon monoxide content. If carbon monoxide is present, then the leak is in one part of the internal combustion engine; if there is no carbon monoxide, the leak is in another part of the cooling water system, through which outside air penetrates. For this purpose, according to a known method (GB-A-1 438 913 and US-A-3 625 656), some gas is removed from the cooling water system, pressed through a test container filled with test liquid, the test liquid of which reacts with the carbon monoxide, if any and undergoes a color change. New test liquid is required for each test.

Der Erfindung liegt die Aufgabe zugrunde, den mit der ständigen Neubeschaffung und dem Nachfüllen von Testflüssigkeit verbundenen Aufwand zu vermeiden und die bei der Kohlenmonoxid-Abgasuntersuchung verwendeten, auf der Infrarotabsorptionsmessung beruhenden Geräte für das Erkennen von Undichtgkeiten des Verbrennungssystems einer wassergekühlten Brennkraftmaschine nutzbar zu machen.The invention has for its object to avoid the effort associated with the constant procurement and refilling of test liquid and to make the devices used in the carbon monoxide exhaust gas analysis, based on the infrared absorption measurement, for the detection of leaks in the combustion system of a water-cooled internal combustion engine.

Diese Aufgabe wird bei der Vorrichtung dadurch gelöst, daß die Kammer als Wasserabscheidkammer ausgebildet ist, daß in der Sonde ein durch das abgeschiedene Wasser betätigbares, schwimmergesteuertes Absperrventil vorgesehen ist und daß die als Durchlaufmeßvorrichtung ausgebildete Meßvorrichtung für Gasanalysen strom ab der Kammer und dem Absperrventil jedoch stromauf einer Pumpe als Saugeinrichtung für das Meßgas angeordnet ist.This object is achieved in the device in that the chamber is designed as a water separating chamber, that a float-controlled shut-off valve which can be actuated by the separated water is provided in the probe, and that the measuring device for gas analyzes designed as a flow measuring device is, however, upstream from the chamber and the shut-off valve a pump is arranged as a suction device for the sample gas.

Diese Aufgabe wird bei dem Verfahren dadurch gelöst, daß das vom Meßgas mitgerissene Wasser abgeschieden wird, ehe das Meßgas an die Meßstelle gelangt, daß das abgeschiedene Wasser gesammelt wird und daß in Abhängigkeit vom mitgerissenen Wasser der Meßgasstrom von der Meßstelle abgesperrt wird.This object is achieved in the method in that the water entrained by the measuring gas is separated before the measuring gas reaches the measuring point, that the separated water is collected and that the measuring gas flow is shut off by the measuring point depending on the entrained water.

Die Erfindung ist anwendbar in Verbindung mit der Messung des CO-Gehaltes in Abgasen für die Fälle, in denen das Abgas der Brennkraftmaschine normalerweise hinreichend CO enthält.The invention is applicable in connection with the measurement of the CO content in exhaust gases for the cases in which the exhaust gas of the internal combustion engine normally contains sufficient CO.

Die Erfindung macht sich den Umstand zunutze, daß aufgrund der modernen Abgasverordnungen in Kraftfahrzeugreparaturwerkstätten, wo solche Prüfungen durchgeführt werden, Kohlenmonoxid-Testgeräte für die Überprüfung des Kohlenmonoxidgehaltes im Abgas zur Verfügung stehen, die wegen der für die Abgasuntersuchung erforderlichen Genauigkeit entsprechend genau und aufwendig ausgebildet sind und auf Infrarotabsorptions_messung beruhen. Die Erfindung gestattet es, mit solchen an sich vorhandenen Geräten den CO-Gehalt auch im Kühlwassersystem zu messen.The invention takes advantage of the fact that, due to the modern exhaust gas regulations in motor vehicle repair workshops where such tests are carried out, carbon monoxide test devices are available for checking the carbon monoxide content in the exhaust gas, which are designed to be correspondingly precise and complex because of the accuracy required for exhaust gas analysis and based on infrared absorption measurement. The invention makes it possible to measure the CO content in the cooling water system with devices such as these.

Die Erfindung nutzt dabei auch die aus anderen Gründen sowieso erforderliche hohe Meßgenauigkeit der vorhandenen CO-Meßgeräte aus und macht sie für das eingangs erwähnte Verfahren nutzbar.The invention also makes use of the high measuring accuracy of the existing CO measuring devices, which is required anyway for other reasons, and makes it usable for the method mentioned at the beginning.

In denjenigen Fällen, in denen das Abgas der Brennkraftmaschine kein oder nur sehr wenig CO enthält, wird zweckmäßig der Gehalt an Kohlendioxid in Meßgas gemessen. Die Rückschlüsse auf Undichtigkeiten können dann entsprechend wie bei der CO-Messung gezogen werden.In those cases in which the exhaust gas from the internal combustion engine contains no or very little CO, the content of carbon dioxide in the measurement gas is expediently measured. The conclusions about leaks can then be drawn in the same way as for the CO measurement.

An sich genügt es zur Feststellung des Gehaltes an Kohlenmonoxid und/oder Kohlendioxid eine hinreichende Menge Meßgas abzusaugen und zu vermessen. Wenndas Ergebnis negativ ist, also kein Kohlenmonoxid und/oder Kohlendioxid im Meßgas festgestellt werden, die für Verbrennungsgase charakteristisch sind, wird aufgrund der Vorgeschichte auf eine Undichtigkeit im sonstigen Kühlwassersystem geschlossen. Diese Diagnose kann man aber erhärten, indem das Meßgas an einer Absaugstelle abgesaugt wird, die gegenüber Nebenluft abgesperrt ist, und der Wassergehalt des Meßgases kondensiert und abgeschieden wird, ehe das Meßgas an die Meßstelle gelangt.In itself, it is sufficient to ascertain and measure a sufficient amount of measuring gas to determine the content of carbon monoxide and / or carbon dioxide. If the result is negative, that is to say no carbon monoxide and / or carbon dioxide are found in the measurement gas, which are characteristic of combustion gases, then a leak in the other cooling water system is concluded on the basis of the history. This diagnosis can be corroborated, however, by suctioning off the sample gas at a suction point that is blocked off from secondary air, and condensing and separating the water content of the sample gas before the sample gas reaches the measuring point.

Wenn dann nur Kohlendioxid angezeigt aber dennoch Lüft angesaugt wird, kann diese Luft nur von einer Undichtigkeit herrühren, die an einer Stelle des Kühlwassersystems außerhalb der Brennkraftmaschine liegt.If only carbon dioxide is displayed but air is still sucked in, this air can only result from a leak that is located at a point in the cooling water system outside the internal combustion engine.

Es empfiehlt sich. vor der Meßstelle den Wassergehalt zu entfernen, um die Messung nicht zu beeinträchtigen. Da in einem fehlerfrei arbeitenden Kühlwassersystem außer Wasserdampf nur eine ganz begrenzte Gasmenge vorhanden ist, wird diese Gasmenge nach kurzer Absaugzeit aufgebraucht sein, sofern von außen kein weiteres Gas in das Kühlwassersystem dringen kann.It is advisable. remove the water content in front of the measuring point so as not to interfere with the measurement. Since there is only a very limited amount of gas in a cooling water system that works correctly, apart from water vapor, this amount of gas will be used up after a short suction period, provided that no other gas can penetrate into the cooling water system from the outside.

Wenn das Kühlwassersystem dicht ist, wird sich nach kurzer Absaugzeit das Vakuum einstellen und das ist dann ein sicheres Zeichen dafür, daß das Kühlwassersystem dicht ist, also weder zur Brennkraftmaschine noch nach außen eine Undichtigkeit aufweist. Das Vakuum ist dabei kein physikalisches Vakuum, sondern ein technisches Vakuum, denn angesichts der Tatsache, daß die Wasserabscheidung nur bis zu einem gewissen Grad vorgenommen wird, wird sich in dem Bereich zwischen Wasserabscheidung und Saugpumpe immer eine geringe Wasserdampfmenge befinden.If the cooling water system is tight, the vacuum will set in after a short suction time and this is a sure sign that the cooling water system is tight, that is to say it has no leakage either to the internal combustion engine or to the outside. The vacuum is not a physical vacuum, but a technical vacuum, because in view of the fact that the water separation is only carried out to a certain degree, there will always be a small amount of water vapor in the area between the water separation and the suction pump.

Die Erfindung wird anhand der beigefügten Zeichnung näher erläutert.The invention is explained in more detail with reference to the accompanying drawing.

Die Zeichnung zeigt eine Sonde mit zugehöriger Durchlaufmeßeinrichtung im Querschnitt.The drawing shows a probe with associated flow measuring device in cross section.

In der Zeichnung ist mit 1 allgemein die Sonde bezeichnet, die an den Kühlwasserbehälter 2 des Kühlwasserkreislaufs einer wassergekühlten Brennkraftmaschine angeschlossen ist. Mit 3 ist eine Durchlaufmeßvorrichtung für Gasanalysen bezeichnet, die über eine Schlauchleitung 4 an die Sonde 1 angeschlossen ist und ihrerseits an die Saugseite einer Gaspumpe 5 angeschlossen ist, deren Druckseite ins Freie führt. Die Durchlaufmeßvorrichtung 3 gestattet es, Gasanalysen durchzuführen auf den Gehalt an Kohlenmonoxid und Kohlendioxid des durchlaufenden Meßgases und gestattet es auch, das in der Zeiteinheit durchfließende Gasvolumen zu messen.In the drawing, 1 generally designates the probe which is connected to the cooling water tank 2 of the cooling water circuit of a water-cooled internal combustion engine. 3 with a flow measuring device for gas analyzes is designated, which is connected via a hose 4 to the probe 1 and in turn is connected to the suction side of a gas pump 5, the pressure side leads to the outside. The flow measuring device 3 makes it possible to carry out gas analyzes for the content of carbon monoxide and carbon dioxide in the measuring gas flowing through and also allows the gas volume flowing through in the time unit to be measured.

Die Sonde 1 besteht aus einem Rohrstück 6 aus durchsichtigem Material, zum Beispiel Glas oder Kunststoff, das an seinem unten gezeichneten, einlaufseitigen Ende durch eine sich zu seinem Einlaufende hin verjüngenden Konus 7 abgeschlossen ist. Der Konus 7 besteht aus Gummi oder gummielastischem Kunststoff und weist einen Einlaßkanal 8 auf, der in die von dem Rohrstück 6 umschlossene Wasserabscheidkammer 9 mündet. An seinem oben gezeichneten Auslaßende ist das Rohrstück 6 durch eine Kappe 10 verschlossen, die von einem Anschlußstutzen 11 durchsetzt ist, der einen Auslaßkanal 12 aufweist.The probe 1 consists of a tube piece 6 made of transparent material, for example glass or plastic, which is closed at its inlet end drawn below by a cone 7 tapering towards its inlet end. The cone 7 is made of rubber or rubber-elastic plastic and has an inlet channel 8 which opens into the water separation chamber 9 enclosed by the pipe section 6. At its outlet end drawn above, the pipe section 6 is closed by a cap 10 which is penetrated by a connecting piece 11 which has an outlet channel 12.

Das Rohrstück 6 ist kreiszylindrisch zur Achse 13. Der Konus 7 und der Anschlußstutzen 11 sind koaxial zur Achse 13 ausgebildet und angeordnet. In Verlängerung des Einlaßkanals 8 erstreckt sich ein Steigrohrstutzen 14, dessen Ende durch eine Kappe 15 verschlossen ist. Unterhalb der Kappe 15 sind auf den Umfang verteilt mehrere Auslaßöffnungen 16, 17 vorgesehen.The pipe section 6 is circular cylindrical to the axis 13. The cone 7 and the connecting piece 11 are formed and arranged coaxially to the axis 13. In an extension of the inlet channel 8, a riser pipe socket 14 extends, the end of which is closed by a cap 15. Below the cap 15 a plurality of outlet openings 16, 17 are provided distributed over the circumference.

Die Sonde 1 sitzt mit dichtem Sitz eingesteckt in die kreisrunde Einfüllöffnung 20 des Kühlwasserbehälters 2. Die Einfüllöffnung 20 befindet sich in der horizontalen oberen Wand 21 des Kühlwasserbehälters 2 und ist demzufolge horizontal und nach oben offen, so daß die Sonde wie gezeichnet mit vertikaler Achse 13 eingesteckt ist und sich in Funktionsstellung befindet.The probe 1 sits tightly inserted into the circular fill opening 20 of the cooling water tank 2. The fill opening 20 is located in the horizontal upper wall 21 of the cooling water tank 2 and is consequently open horizontally and upwards, so that the probe as shown with the vertical axis 13 is plugged in and is in the functional position.

In dem Anschlußstutzen 11 ist ein Wasserabscheideventil 22 untergebracht. Zu dem Wasserabscheideventil 22 gehört eine in Wasser schwimmfähige Kugel 24, dieser nachgeordnet ein Ventilsitz 23 und der Kugel 24 vorgeordnet eine Halterung 25.A water separating valve 22 is accommodated in the connecting piece 11. The water separating valve 22 includes a ball 24 that floats in water, a valve seat 23 arranged downstream of this, and a holder 25 arranged upstream of the ball 24.

Solange sich kein Wasser im Anschlußstutzen 11 befindet, ruht die Kugel 24 auf der Halterung 25 und gibt den Gasdurchlaß durch den Anschlußstutzen 11 frei. Gelangt Wasser in den Anschlußstutzen 11, dann wird die Kugel schwimmend hochgetragen, lehnt sich gegen den Ventilsitz 23 und sperrt den Anschlußstutzen 11 für die weitere Druchströmung ab.As long as there is no water in the connecting piece 11, the ball 24 rests on the holder 25 and releases the gas passage through the connecting piece 11. If water gets into the connecting piece 11, the ball is carried up floating, leans against the valve seat 23 and shuts off the connecting piece 11 for further flow.

Auf dem Anschlußstutzen 11 steckt der Schlauch 4, der zum Einlaßanschluß der Durchlaufmeßvorrichtung 3 führt. In der Durchlaufmeßvorrichtung 3 wird der Kohlenmonoxidgehalt und/oder der Kohlendioxidgehalt des durchströmenden Meßgases laufend gemessen. Vorzugsweise handelt es sich dabei um eine Absorptionsmessung im Infrarotbereich.The hose 4, which leads to the inlet connection of the flow measuring device 3, is placed on the connecting piece 11. The carbon monoxide content and / or the carbon dioxide content of the measuring gas flowing through is continuously measured in the flow measuring device 3. This is preferably an absorption measurement in the infrared range.

Die Vorrichtung wird wie folgt betrieben. Bei laufender Brennkraftmaschine wird die Sonde in die gezeichnete Funktionsstellung gebracht und die Gaspumpe 5 eingeschaltet. Es wird auf diese Weise oberhalb des Kühlwasserspiegels 26 befindliches Gas abgesaugt. Dieses Gas strömt durch den Einlaßkanal 8 und die Öffnungen 16, 17 in die Wasserabscheidkammer 9. Wassergehalt wird kondensieren und nach unten abfließen und sammelt sich im unteren Bereich der Wasserabscheidkammer 9. Das trockene Gas strömt durch den Schlauch 4 als Meßgas zur Durchlaufmeßvorrichtung, wird dabei vermessen und strömt dann durch die Gaspumpe 5 ins Freie.The device operates as follows. When the internal combustion engine is running, the probe is brought into the functional position shown and the gas pump 5 is switched on. In this way, gas located above the cooling water level 26 is extracted. This gas flows through the inlet channel 8 and the openings 16, 17 into the water separating chamber 9. Water content will condense and flow downwards and collects in the lower area of the water separating chamber 9. The dry gas flows through the hose 4 as measuring gas to the flow measuring device measured and then flows through the gas pump 5 into the open.

Gelangt nach einer kurzen Anlaufzeit kein Gas mehr an die Durchlaufmeßvorrichtung, dann ist das ein Zeichen dafür, daß der Kühlwasserkreislauf dicht ist, denn es wird nur Wasserdampf angesaugt, der in der Wasserabscheidkammer 9 abscheidet. Wird Luft angesaugt, aber kein Kohlenmonoxid und kein Kohlendioxid in dieser Lüft festgestellt, dann ist das ein Zeichen dafür, daß das Kühlwassersystem undicht ist, aber nicht im Bereich der Brennkraftmaschine. Wird dagegen Luft angesaugt mit einem Gehalt an Kohlenmonoxid und/oder Kohlendioxid, dann ist das ein Zeichen dafür, daß der Kühlwasserkreislauf im Bereich der Brennkraftmaschine undicht ist.If, after a short start-up time, no more gas reaches the flow measuring device, then this is a sign that the cooling water circuit is tight, because only water vapor that separates in the water separating chamber 9 is sucked in. If air is sucked in, but no carbon monoxide and no carbon dioxide are found in this vent, this is a sign that the cooling water system is leaking, but not in the area of the internal combustion engine. If, on the other hand, air is sucked in with a content of carbon monoxide and / or carbon dioxide, this is a sign that the cooling water circuit in the area of the internal combustion engine is leaking.

Claims (6)

1. Device for detection of leaks in the combustion system of a water-cooled combustion engine by analysing gas from the cooling water circuit for carbon monoxide and/or carbon dioxide content, using a probe (1) which is fitted with a chamber (9), the chamber (9) being capable of forming a sealed connection at its outlet to the filler opening (20) for the cooling water tank (2) of the cooling water circuit and having the other end connected to a suction device (5), and with a measuring device (3) for gas analysis on the suction side of the suction device (5), characterised in that, the probe (1) is fitted with a float- controlled shut-off valve (23, 24, 25) capable of being operated by the separated water and that the measuring device for gas analysis, designed as a flowmeter (3), is arranged downstream of chamber (9) and the shut-off valve (23, 24, 25) is, however, upstream of a pump (5) as a suction device for the measuring gas.
2. Device in accordance with Claim 1, characterised in that, the walls (6) of chamber (9) are transparent.
3. Device in accordance with Claim 1 or 2, characterised in that, on the outlet side of chamber (9) a connecting adapter (11) for a hose connection is provided, the adapter being connected via hose (4) to flowmeter (3).
4. Device in accordance with the foregoing claims, characterised in that, a riser pipe (14), which in the coaxial extension of inlet channel (8) projects into the centre of water separator chamber (9), is closed at its end and has outlet holes (17) distributed around the circumference close to the closed end.
5. Device in accordance with the foregoing claims, characterised in that, the water shut-off valve (22) has a ball (24) capable of floating on water, with a valve seat (23) after the ball in the direction of flow, on which the ball seats to form a seal and with a retainer (25) for the ball arranged before the ball in the direction of flow.
6. Method for detection of leaks in the combustion system of a water-cooled combustion engine by analysing gas from the cooling water circuit for the presence of carbon monoxide and/or carbon dioxide, whereby with the combustion engine running measuring gas is sucked from the gas area of the cooling water system and drawn past a measuring point whereby the carbon monoxide and/or carbon dioxide content of the measuring gas in measured at the measuring point enabling combustion gas from the combustion engine to be determined using a device in accordance with Claim 1, characterised in that, the water entrained by the measuring gas reaches the measuring point, the separated water is collected and the measuring gas stream is shut-off from the measuring point depending on the entrained water.
EP19830112975 1983-03-30 1983-12-22 Device and method for detecting leaks in the combustion system of a water-cooled internal-combustion engine Expired EP0122975B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83112975T ATE27038T1 (en) 1983-03-30 1983-12-22 DEVICE AND METHOD FOR DETECTING LEAKS IN THE COMBUSTION SYSTEM OF A WATER-COOLED ENGINE.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3311611 1983-03-30
DE3311611 1983-03-30
DE3342242 1983-11-23
DE19833342242 DE3342242C2 (en) 1983-03-30 1983-11-23 Device and method for detecting leaks in the combustion system of a water-cooled internal combustion engine

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EP0122975A1 EP0122975A1 (en) 1984-10-31
EP0122975B1 true EP0122975B1 (en) 1987-05-06

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DE4129070A1 (en) * 1991-09-02 1993-03-04 Grundig Emv METHOD FOR CARRYING OUT LEAK TESTS IN EXHAUST GAS TESTERS
DE19623412B4 (en) 1996-06-12 2008-05-29 Basf Se Process for the preparation of polymer powder
US6806092B1 (en) * 2001-08-17 2004-10-19 The Lisle Corporation Combustion gas detection system
DE102004039627A1 (en) * 2004-08-10 2006-02-23 Autotestgeräte Leitenberger GmbH Fluid leakage localizing method for e.g. air conditioning system, involves bringing free gas into cooling circuit and scanning circuit with reaction medium for localizing fluid leakages in circuit at locations where gas reacts with medium
DE102005055493B4 (en) * 2005-11-18 2008-07-03 Siemens Ag Device for cooling an internal combustion engine
AU2014234553A1 (en) 2013-03-18 2015-09-24 Basf Se Method for producing polymer powders that can be easily redispersed in water
CN103353375A (en) * 2013-07-10 2013-10-16 浙江省电力设计院 Natural gas collecting and leakage monitoring device
CN114577399B (en) * 2022-01-18 2024-07-19 潍柴动力股份有限公司 Engine air leakage detection method and detection device

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EP0122975A1 (en) 1984-10-31
DE3342242A1 (en) 1984-10-04
DE3342242C2 (en) 1987-01-29

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